One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,4,5)(3,6,7,8)(9,10)(11,14)(12,16)(13,15)(17,21)(18,20)(19,22)(23,24)(25,26)(27,36)(28,41)(29,34)(30,46)(31,35)(32,38)(33,44)(37,50)(39,49)(40,48)(42,47)(43,51)(45,56)(52,53)(54,55)(2,5)(6,8)(9,11,13,17)(10,14,15,21)(12,18,19,23)(16,20,22,24)(25,27,30,38,31,40,29,39)(26,32,34,36,35,49,46,48)(28,42,44,54,45,37,43,53)(33,50,41,55,51,47,56,52)(1,3,4,7)(2,6,5,8)(10,15)(11,17)(16,22)(18,23)(25,28,30,44,31,45,29,43)(26,33,34,41,35,51,46,56)(27,37,38,53,40,42,39,54)(32,47,36,52,49,50,48,55)(9,12)(10,16)(11,18)(13,19)(14,20)(15,22)(17,23)(21,24)(25,29,31,30)(26,34,35,46)(27,38,40,39)(28,43,45,44)(32,48,49,36)(33,41,51,56)(37,53,42,54)(47,55,50,52)(12,19)(16,22)(18,23)(20,24)(25,29,31,30)(26,34,35,46)(27,39,40,38)(28,43,45,44)(32,36,49,48)(33,41,51,56)(37,54,42,53)(47,52,50,55)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.